提交 06348574 编写于 作者: C Christoph Hellwig 提交者: Chris Mason

Btrfs: enable discard support

The discard support code in btrfs currently is guarded by ifdefs for
BIO_RW_DISCARD, which is never defines as it's the name of an enum
memeber.  Just remove the useless ifdefs to actually enable the code.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NChris Mason <chris.mason@oracle.com>
上级 e244a0ae
......@@ -1568,18 +1568,15 @@ static int remove_extent_backref(struct btrfs_trans_handle *trans,
return ret;
}
#ifdef BIO_RW_DISCARD
static void btrfs_issue_discard(struct block_device *bdev,
u64 start, u64 len)
{
blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL);
}
#endif
static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr,
u64 num_bytes)
{
#ifdef BIO_RW_DISCARD
int ret;
u64 map_length = num_bytes;
struct btrfs_multi_bio *multi = NULL;
......@@ -1606,9 +1603,6 @@ static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr,
}
return ret;
#else
return 0;
#endif
}
int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
......
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